<template>
  <view class="goods-detail-container">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
      <swiper-item v-for="(item, i) in goodsDetail.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>

    <!-- 商品信息区域 -->
    <view class="goods-info-box" v-if="Object.keys(goodsDetail).length > 0">
      <!-- 商品价格 -->
      <view class="price">￥{{goodsDetail.goods_price}}</view>
      <!-- 信息主体区域 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">{{goodsDetail.goods_name}}</view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递：免运费</view>
    </view>

    <!-- 商品详细介绍 -->
    <rich-text :nodes="goodsDetail.goods_introduce"></rich-text>

    <!-- 商品导航组件 -->
    <view class="goods-nav">
      <!-- fill 控制右侧按钮的样式 -->
      <!-- options 左侧按钮的配置项 -->
      <!-- buttonGroup 右侧按钮的配置项 -->
      <!-- click 左侧按钮的点击事件处理函数 -->
      <!-- buttonClick 右侧按钮的点击事件处理函数 -->
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
        @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  import {
    mapState,
    mapMutations,
    mapGetters
  } from 'vuex'
  export default {
    data() {
      return {
        goodsDetail: {}, // 商品详情

        // 商品底部导航
        options: [{
          icon: 'shop',
          text: '店铺'
        }, {
          icon: 'cart',
          text: '购物车',
          info: 0
        }],
        // 右侧按钮组的配置对象
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]
      };
    },

    computed: {
      ...mapState('m_cart', ['cart']),
      ...mapGetters('m_cart', ['total', 'totalCount'])
    },

    watch: {
      // total(newTotal) {
      //     this.options[1].info = newTotal  || '[]'
      // }
      totalCount: {
        handler(newTotal) {
          this.options[1].info = newTotal || '0'
        },
        immediate: true
      }
    },

    onLoad(options) {
      // 获取商品详情
      this.getGoodsDetail(options.goods_id)

      // 初始化购物车数量
      // this.options[1].info = this.total
    },

    methods: {
      ...mapMutations('m_cart', ['addCart']),
      // 获取商品详情
      async getGoodsDetail(goods_id) {
        const {
          data: res
        } = await uni.$http.get('/goods/detail', {
          goods_id: goods_id
        })

        // 请求失败
        if (res.meta.status !== 200) return uni.$showMsg()

        // 数据格式清理
        res.message.goods_introduce = res.message.goods_introduce
          .replace(/<img /g, '<img style="vertical-align: middle;"')
          .replace(/.webp/g, '.jpg')
        // 请求成功 - 数据赋值
        this.goodsDetail = res.message
      },

      // 点击轮播图, 进行预览
      preview(i) {
        uni.previewImage({
          urls: this.goodsDetail.pics.map(item => item.pics_big_url),
          current: i
        })
      },

      // 商品导航事件处理函数
      onClick(e) {
        // console.log('onClick', e)
        if (e.content.text === '购物车') {
          // 跳转到购物车页面
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },

      buttonClick(e) {
        // console.log('buttonClick', e)
        if (e.content.text === '加入购物车') {
          // 拼装购物车商品对象
          const goods = {
            goods_id: this.goodsDetail.goods_id,
            goods_small_logo: this.goodsDetail.goods_small_logo,
            goods_name: this.goodsDetail.goods_name,
            goods_price: this.goodsDetail.goods_price,
            goods_state: true,
            goods_count: 1
          }
          this.addCart(goods)
        }
      }
    }
  }
</script>

<style lang="scss">
  .goods-detail-container {
    // 给页面外层的容器，添加 50px 的内padding，
    // 防止页面内容被底部的商品导航组件遮盖
    padding-bottom: 50px;

    swiper {
      height: 750rpx;

      image {
        width: 100%;
        height: 100%;
      }
    }

    // 商品信息区域的样式
    .goods-info-box {
      padding: 10px;
      padding-right: 0;

      .price {
        color: #c00000;
        font-size: 18px;
        margin: 10px 0;
      }

      .goods-info-body {
        display: flex;
        justify-content: space-between;

        .goods-name {
          font-size: 13px;
          padding-right: 10px;
        }

        // 收藏区域
        .favi {
          width: 120px;
          font-size: 12px;
          display: flex;
          flex-direction: column;
          justify-content: center;
          align-items: center;
          border-left: 1px solid #efefef;
          color: gray;
        }
      }

      // 运费
      .yf {
        margin: 10px 0;
        font-size: 12px;
        color: gray;
      }
    }

    // 商品导航
    .goods-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
    }
  }
</style>
